Rotational and Rotational-Vibrational Raman Spectroscopy of Air to Characterize Astronomical Spectrographs
Journal
Date Issued
2019
Author(s)
Vogt, Frédéric P. A.
•
Kerber, Florian
•
Mehner, Andrea
•
Yu, Shanshan
•
Pfrommer, Thomas
•
Lo Curto, Gaspare
•
Figueira, Pedro
•
Parraguez, Diego
•
Pepe, Francesco A.
•
Mégevand, Denis
•
•
•
Lovis, Christophe
•
Amate, Manuel
•
•
Cabral, Alexandre
•
Osorio, Maria Rosa Zapatero
Abstract
Raman scattering enables unforeseen uses for the laser guide-star system of the Very Large Telescope. Here, we present the observation of one up-link sodium laser beam acquired with the ESPRESSO spectrograph at a resolution λ /Δ λ ˜140 000 . In 900 s on source, we detect the pure rotational Raman lines of 16O2, 14N2, and 14N 15N (tentatively) up to rotational quantum numbers J of 27, 24, and 9, respectively. We detect the 16O2 fine-structure lines induced by the interaction of the electronic spin S and end-over-end rotational angular momentum N in the electronic ground state of this molecule up to N =9 . The same spectrum also reveals the ν1 ←0 rotational-vibrational Q-branch for 16O2 and 14N2 14. These observations demonstrate the potential of using laser guide-star systems as accurate calibration sources for characterizing new astronomical spectrographs.
Volume
123
Issue
6
Start page
061101
Issn Identifier
0031-9007
Ads BibCode
2019PhRvL.123f1101V
Rights
open.access
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